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authorJesse Gross <jesse@nicira.com>2011-11-19 16:21:37 -0800
committerJesse Gross <jesse@nicira.com>2011-12-03 09:35:08 -0800
commitb4e16611c4e1cd98765269c8fdaf43f96baa57b1 (patch)
tree3ca0f230d24748d51726c7e5bb392529a8d65009 /include/linux/genetlink.h
parent86b1309c7e411b7c25dc0dc7a092582a4d291044 (diff)
genetlink: Add rcu_dereference_genl and genl_dereference.
This adds rcu_dereference_genl and genl_dereference, which are genl variants of the RTNL functions to enforce proper locking with lockdep and sparse. Signed-off-by: Jesse Gross <jesse@nicira.com>
Diffstat (limited to 'include/linux/genetlink.h')
-rw-r--r--include/linux/genetlink.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/include/linux/genetlink.h b/include/linux/genetlink.h
index 59311adfb0e0..73c28dea10ae 100644
--- a/include/linux/genetlink.h
+++ b/include/linux/genetlink.h
@@ -89,6 +89,27 @@ extern void genl_unlock(void);
extern int lockdep_genl_is_held(void);
#endif
+/**
+ * rcu_dereference_genl - rcu_dereference with debug checking
+ * @p: The pointer to read, prior to dereferencing
+ *
+ * Do an rcu_dereference(p), but check caller either holds rcu_read_lock()
+ * or genl mutex. Note : Please prefer genl_dereference() or rcu_dereference()
+ */
+#define rcu_dereference_genl(p) \
+ rcu_dereference_check(p, lockdep_genl_is_held())
+
+/**
+ * genl_dereference - fetch RCU pointer when updates are prevented by genl mutex
+ * @p: The pointer to read, prior to dereferencing
+ *
+ * Return the value of the specified RCU-protected pointer, but omit
+ * both the smp_read_barrier_depends() and the ACCESS_ONCE(), because
+ * caller holds genl mutex.
+ */
+#define genl_dereference(p) \
+ rcu_dereference_protected(p, lockdep_genl_is_held())
+
#endif /* __KERNEL__ */
#endif /* __LINUX_GENERIC_NETLINK_H */